Dr. Lo's 2011 slides of presenting his study showing his findings that ME/CFS patients were infected with XMVR. They are highly technical. However, the first few slides explain in lay-person's terms why the XMVR virus was being studied in regard to ME/CFS. It was later that his and other investigators' results were shown to be the result of contamination in the lab.
Dr. Lo's slides for the NIH video "Chronic Fatigue Syndrome--Is There a Virus?"
https://demystifyingmedicine.od.nih.gov/DM11/02-22-2011/2011-02-22-Lo.htm